Drag reducing effects in district heating networks
Krope, Andrej ; Krope, Jurij ; Črepinšek, Ljubomir, 1936-2023
In this paper the simulation of flow-pressure conditions in the pipe network during the transport of hot water only and hot water with added surfactant additive Dobon G/NaSal for a part of the ...district heating system of the city of Maribor is presented. With small amounts of cationic surfactants in district heating water the turbulence intensity in pipes is decreased and the pressure drop in pipelines is reduced significantly. The aaplication of drag reducing additives in existing systems reduces pumping costs and increases the capacity. New district heating networks can be designed with smaller pipe diameters and pumps with reduced pump power or the maximum economic transmission length can be increased with the application of surfactants. The mathematical model is composed of nonlinear equations for the determination of incompressible fluid flow characteristcs and extra determined empirical equation of friction coefficient in dependence of Reynolds number for the solution of surfactant in hot water.
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